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Message-ID: <20121209021524.GA1480@openwall.com>
Date: Sun, 9 Dec 2012 06:15:24 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: bitslice DES on GPU
On Sun, Dec 09, 2012 at 05:49:22AM +0400, Solar Designer wrote:
> Oh, there's also field code 255, which means "Literal constant", "32-bit
> constant from instruction stream". Apparently, this is precisely the
> case when a GCN instruction is 64-bit rather than 32-bit.
No, it's not the only case when a GCN instruction is 64-bit. There are
other cases as well - notably, there are LDS/GDS access instructions
that also perform computation, and these use 64-bit encoding too.
Alexander
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